Rectifier



H. P. DONLE 1,850,451

RECTIFIER March 22, 1932'.

Filed Oct. 4, 1926 ea, o o@ 00o III.. Ii 0 INVENTOR Patented Mar. 22, 1932 U STATES PATENT OFFICE HAROLD P. DONLE, OF 4.lVIE-IRIDEN, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGNMENTS, TO RADIO INVENTIONS, INC., A CORPORATION OF NEW 'YORK RECTIFIER n Application filed October 4, 1926. Serial No. 139,436.

My invention relates particularly to what are commonly termed hot cathode tubes, One object is to provide a simple, reliable and etlicient rectifier for use in the power supply of radio receiving sets.

In its preferred form the invention will comprise a tube containing a i'ilamentary cathode with two anodes partially embracing said cathode. These electrodes are arranged so as to mutually cooperate for effective results. The electrodes are tied or stayed by a simple sort of truss formation so as to hold them securely in their proper relative posi- A tions. The tube is filled with some lind of i ionizable gas at a low pressure.

Fig. 1 is a side view of a rectifier embody` ing one forni of my invention.

F ig. 2 is a transverse section of the same.

Fig. 3 is a perspective view showing parts of the interior structure.

The tube 5 may be of any suitable construction and preferably contains a press 6 at the lower end in which are secured the various conducting and supporting` wires.

The cathode elementconsists of two parts or sections, 7 and 8, each of which is in the form of an inverted V. These sections have their inner adj aceiit ends joined or electricalj ly connected together and mechanically coni nected to the central support 9 and have conductive supports 10 and 11 for their outer ends. The center of each section is supported by a spring hook member such as 12 and 13.

The anodes 14 and 15 are trough shaped and partially embrace the two cathode ele ments. The cathodes and anodes are arranged so as to mutually cooperate for edective action. The anodes are supported by conduc- 1 tor wires 16 and 17, which for convenience in manufacture are welded to the lower ends of wires 18 and 19, which in turn are welded to the side edges of the anodes.

rEhe anode conductors 16 and 17' are preferably sealed in the outer opposite edges of the press 6 so that they will be as far apart as possible on account of the great difference in potential which may exist between them.

To more securely hold the parts in their proper relative positions, 1 provide a sort of truss consisting of an insulator preferably in the form of a glass bead or bar 2O in which to both of them. The hook wires 12 and 13 are welded to the upper ends of the wires 22 and 23 and should be sufiiciently light and resilient to provide a slight tension on the filament without straining it. ends of the wires 211 and 25 are bent over and welded to the upper ends of the side wires 18 and 19 near the upper ends of the anodes which thus brace the outer ends of the anodes. Fig. 3 shows the electrodes separated from the other parts of the truss-like structure.

The electrodes are preferably enveloped in an atmosphere of some ionizable gas which will properly coact with the filament to pro- The upper l duce the eifect of increased emission without injuring the iilament. Such a combination I have found in the use of a thoriated molybdenum cathode in an atmosphere of iodine. Only a small amount of iodine is necessary or desirable. I have found a pressure of from .01 to .001 millimeters of mercury satisfactory. The conditions should produce partial or non-cumulative ionization without glow. Such a combination operates at a comparatively low temperature with efficiency. l

The anodes may be of nickel.

It should be understood, however, that I consider that other highly refractory filaments may be used such as tungsten. So also other rare earth oxide coatings may be used.

l also consider that other gases may be emf ployed to produce somewhat similar results.

I claim: 1. A full wave rectiiier comprising a tube having a press withiive supporting wires Y Y Y having an internal press at one end with tive supporting wires sealed therein, a cathode n filament consisting of two inverted V-shaped sections connected together at their inner ends, said inner ends being supported by one l0 Jofsaid wires and having their outer ends elec` trically connected to `and mechanically supported by two of the other supporting wires, an insulating member supported by the'first mentioned wire, two wires supported by said insulating member and 1n turn supporting the mid-points of the twoy cathode sections, two anode structures mechanically and electrically supported by the remaining two supporting wires which are sealed in the press and supplemental bracing wires secured tok said insulatingmember andconnected to the outer ends of the anode structures, each of said anode structures including at least two plate portions 'spaced apart from and substantially parallel with the central planes ot' the respective cathode-sections.

3. A vfullwave rectiiiereomprising a tube having an internall press at one end with at least four supporting wires sealed therein, two anode structures mechanically and electrically supported by two of said supporting wires, an insulating member, bracing wires secured to said insulating member and connectedfto theouter endsL of the anode structures, a `cathodeilament consisting of two inverted V-shaped vsections connected together Y at their inner ends and having their outer ductors anda support all carried by 'said'f press, an anode supported by each of two ofV said conductors, each anode having twoparallel spaced-'apart side members connected Vat adjacent edges, an insulating spacer, bracvtionsvby said support, the Yother ends of the filament sections being electrically connected to'rthe remaining two conductors carried by the press, and tensioning supporting meansV 'for the mid-points of the two filament sections carried by said insulating spacer, each filament section being supported substantially in the center of an anode between its spaced apart side members.

HAROLD P. DoNLE.

ends electrically connected to and mechanit cally supportedby two of the other support- 0 ing wires, two wires extending fromk said insulating member and supporting the midf points of the two cathode sections, eac-h of vsaid anode structures including at least two plate portions spaced apart from and sub- 45 stantially parallel with the central planes Y of the respective cathode sections, and means ofy mechanical connectionand support between the insulating member and the inner ends ofthe cathode sections. Y p y.

50 n 4. A full wave rectiier comprising an envelope having a press at one end, five supporting wires sealed in said press, four of said wiresvconstituting conductors, an insulator supported by the fifth wire, two inverted V- 55 shaped ilamentary cathode sections suspended from said insulator, one end of each secytion being held in li-Xed position bymeans including'said lifth wire, the other end ofeach section being connected to one of said cono ductors, va fiat sided anode embracing each cathode section and supported by one of the remaining conductors, and bracing means connecting the anodes and said insulator.

' 5. A full wave rectifier comprising an en- 65 velope having a press at one end, -four con- 

